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Medium
- articles[remove]7
- instructional materials7
- sound recordings6
- photographs5
- timelines (chronologies)5
- letters (correspondence)4
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- black-and-white photographs3
- correspondence2
- documentaries and factual works2
- legislative records2
- maps2
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- annotated bibliographies1
- biographies1
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- interviews1
- learning modules1
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- maps (documents)1